\documentclass[tikz,border=2mm]{standalone}
\usepackage{array,amsmath,mathptmx,xcolor,bbding,pifont,amssymb}
\usepackage[UTF8]{ctex}
\newcolumntype{C}[1]{>{\centering\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}
\usepackage{tikz-cd}
\usepackage{tikz,graphicx,subfig,caption} % Required for drawing custom shapes
\usetikzlibrary{fit,matrix,chains,arrows,shapes,positioning,arrows.meta,chains,shadows,shapes.callouts,decorations.text,shapes.symbols,shapes.misc, positioning,decorations.pathreplacing,calc}
\begin{document}
	\begin{tikzpicture}[>=latex,every node/.style={anchor=south west,,inner sep=0,fill=white}]
		
		%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
		\node[drop shadow] at (5em,0) (SYNBL){
			\begin{tabular}{|C{20em}|}
				\hline 
				\color{blue}$\#$ $\lessdot$ a  $\lessdot$ S $=$ b $\gtrdot$ e $\lessdot$ a $\lessdot$ e $\gtrdot$ $\#$  \\ \hline
			\end{tabular}
		};
		\node(point1) at ([xshift=-1.90em,yshift=-0.72em]SYNBL.north) {\color{blue}{.}};
		
	\end{tikzpicture}
\end{document}